import random
n = input()
nn = len(n)
a = []
for i in n:
	a.append(i)
a.sort()
b = 0
for i in a:
	b *= 10
	b += int(i)
# print(b)
a.sort(reverse=True)
c = 0
for i in a:
	c *= 10
	c += int(i)
# print(c)

def gcd(a, b):
	if a == 0:
		return b
	if b == 0:
		return a
	return gcd(b, a%b)

ans = gcd(b, c)
print(ans)
# for i in range(30):
# 	for j in range(100):
# 		aa = random.randint(0, nn-1)
# 		bb = random.randint(0, nn-1)
# 		a[aa], a[bb] = a[bb], a[aa]
# 	d = 0
# 	for i in a:
# 		d *= 10
# 		d += int(i)
# 	ans = gcd(ans, d)
# print(ans)